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Volume 2 Issue 1
 
Volume & Issue: Volume 2 Issue 1

Modal strain energy change ratio for damage identification in honeycomb sandwich structures
  Volume 2,Issue 1
 

Author :

K. R. Pradeep - B. Nageswara Rao - S. M. Srinivasan - K. Balasubramaniam

 

Abstract :

This paper deals with the generation of layered finite element models using a standard finite element package for simulation of undamaged and delaminated sandwich structures that are appropriate to vibration based structural health monitoring (SHM) and damage detection techniques. The intact regions are modelled using three layered elements. The skin-core debonded regions are modelled using single layer elements representing debonded top or bottom skin and two layer element representing the core and bottom or top skin either side of the debond along with contact definition between skin and core. Modal analysis has been carried out on honeycomb sandwich plate configurations and the changes in the frequencies due to debond calculated. A meaningful parameter called 'Modal Strain Energy Change Ratio (MSECR) is used as an indicator for damage indicator in sandwich structures. The present numerical experiments and validation with the existing test results indicate the efficiency of the MSECR as an indicator for damage in sandwich structures.

 

Keywords :

Debond - Finite element model - Frequency - Honeycomb sandwich panel - Modal strain energy change

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